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Thermoelectric power of high Tc superconductor CaBaACu3Oy with A=Y and lanthanide

✍ Scribed by Yung Woo Park; Hyuk Park; Young Seok Song; Hyeong Cheol Lee; Min Soo Jang

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
390 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

Temperature dependent thermoelectric power (TEP) of high T superconductor CaBaACu 3 0 with A=Y, Yb, Er, Dy, Gd, Eu, Sm and La is studied to investigatCe the superconducting mecHanism. For A=Y and Yb, negative TEP is observed.

On the other hand, positive TEP is observed for A=La, Sm, Eu, Gd and Dy.

In all samples, however, a broad peak is exhibited at near above the superconducting transition temperature.

The atomic size of the Y and Lanthanide as well as the oxygen deficiency may be important for the observed TEP data.

Qualitative description on the general features of resistivity and TEP data are presented.

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New high-Tc superconductor families of A
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New high-temperature and nontoxic superconductor families of Ag 1-xCuxBa2Can-lCunO2n+3-y witl~ Tc = 117 K and CuBa2Can-lCunO2n+4-y with Tc =116 K were discovered. These materials were prepared by the highpressure technique. The highest Tc was obtained for n=4 i.e. Agl-xCuxBa2Ca3Cu4Oll.y (Ag-1234) an